Bismuth induced enhanced green emission from terbium ions and their complex in thin films

Abstract

Bismuth nanoparticles (NPs) have been prepared by the pulsed laser ablation technique using the third harmonics of a Nd-YAG laser. UV-absorption and TEM micrographs show Bi NPs of spherical shape with the average particle size ranging from 15 to 20 nm. These NPs were dispersed with Tb(3+) ions and their complex with salicylic acid (Sal) in polyvinyl alcohol to obtain thin films. The influence of Bi NPs on the emissive properties of Tb(3+) ions and the [Tb(Sal)3(phen)] complex has been studied by luminescence spectroscopy using 266 nm and 355 nm as excitation wavelengths. The luminescence intensity of Tb(3+) ions complexed with Sal in the thin polymer films increased significantly as compared to the Tb(3+) ions in the presence of Bi NPs on excitation at 355 nm. However, terbium ions in the case of the [Tb(Sal)3(phen)] complex together with NPs show an intense and extended emission spectrum in the 375-700 nm range for transitions arising from (5)D3 and (5)D4 levels to different (7)F(J) levels on 266 nm excitation. The luminescence enhancement has also been supported by lifetime measurements.

Fluorimetric determination of febuxostat in dosage forms and in real human plasma via Förster resonance energy transfer

“…In the fluorescence emission spectrum of Tb 3+ ion (Figure ), six main emission peaks at 375, 490, 545, 590, 623 and 740 nm were displayed. These peaks correspond to transition of 5 D 3 → 7 F J (2–6), 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , 5 D 4 → 7 F 3 and 5 D 4 → 7 F 2 ; respectively …”

“…[27] Due to, intramolecular respectively. [30,34] Furthermore, 5 D 4 excited state level of Tb 3+ ion is located above the triplet state level of FBX. As a result, radiationless energy from Tb 3+ ion to FBX is transferred.…”

Spectroscopic Investigations on Polyvinyl Alcohol Film with Complex of Terbium Ions along with Bismuth Nanoparticles for Improved Green Emission

“…The photoluminescence excitation spectra of Tb ions with Bi nanoparticles (B) and the (Tb(Sal) 3 (Phen)) complex with Bi NPs (C) in PVA in the range of 375-700 nm using 266 nm radiation exciting the SPR band of Bi NPs (reproduced from Kaur et al [24] ions. When Bi NPs were added to TbCl 3 , the excitation intensity of the bands got improved.…”

“…This incident excitation energy is directly absorbed by the ion. SPR refers to surface plasmon resonance, LFE stands for local ield efect, and ET represents energy transfer (reproduced from Kaur et al [24]). Figure 15).…”

“…The size-induced semimetal to semiconductor transition and the related quantum coninement efects are potentially useful for optical and electro-optical device applications [2,10,16,36,37]. It has a high carrier mobility, a highly anisotropic Fermi surface, and miniature efective mass [2,24,46]. Below the size of 30 nm, the Bi NPs behave as semiconductors [44].…”